Under-water exhaust for explosive and other engines.



N. W. MONTGOMERY. UNDER-WATER EXHAUST FOR EXPLOSIVE AND OTHER'ENGINE&

APPLICATION FILED AUG.'7,1912.

Patented June 24, 1913 Wain 0w 1s 0s I 1100: M 01:

6? ll 107a) as W #7024 (901110111;

UNITED strx'rps PATENT OFFICE.

NICHOLAS MONTGOMERY, OF GLOUCESTER, MASSACHUSETTS.

UNDER-WATER EXHAUST FOR' EX PLOSIVE AND OTHER ENGINES.

To all whom it may concern:

Be it known that I, NICHOLAS W. MONT- coarser, a citizen of the UnitedStates, and a resident of Gloucester, in the county of IIssex and Stateof Massachusetts, have invented an Improvement in Under-Water Exhaustsfor Explosive and otherEngines, of which the following description, inconnection with the accompanying drawings, is a specification, likecharacters on the drawing representing like parts.

This invention relates to exhausts for explosive and other engines, andis particularly adapted for use as .an under-water exhaust for explosiveengines employed in motor boats.

In orderthat the principle of the invention may be readily understood,I'have disclosed a singleembodiment thereofin the accompanying drawing,wherein Figure 1 is a vertical View partially in side elevation andpartially in-vertical'section of one embodiment or form of theinvcntion; Fig. 2 is an underneath plan of the shall describe theinvention with special refcrence to such use, it is to be understoodthat it is in no respect limited thereto, but so far as certain featuresthereof are concerned, it is of general application.

Owing to the noise made by the exhausts ofsmotor boats, the exhaustshave been submerged, but, so far as I am aware, with the invariableresult of decreasing the speed of the boat. The exhaust herein disclosednot only does not decrease thespeed of the boat, but it does away withall noise of exhaust, all odor, vibration. excepting that of the engine,and pounding upon the bottom of the boat. I have been enabled, byemploying the submerged exhaust herein disclosed, to drive the boat at agreater speed than when employing an open exhaust, without mufiling.

v Specification of Letters Patent. Ia1;eifl;ed June 24, 1913.Application filed August 7, 1912. Serial No. 713,703. 7

Referring more particularly to the drawing, I have therein representedan exhaust chamber 1 of any suitable shape and construction whereintothe exhaust motive agent from the engine is admitted through the pipe 2.Herein I have represented the pipe 2 as opening into the forward end ofthe exhaust chamber 1. While the size of the chamber 1 may 'be largelyvaried within the scope of my invention, I have obtained excellentresults by making it of such size that its capacity is substantially sixtimes the capacity of the compression chamber of the gasolene or otherexplosive'engine with which I preferably employ it.

At a suitable point with relation .to the pipe 2, I provide a battlelate 3 herein represented as extending fr m the lower portion of theforward end 5 of the exhaust Y chamber 1 in an upward and rearwarddirect'ion to a point 6 adjacent the top of said exhaust chamber. Thesaid baflle plate may be formed with the walls of the chamber orsuitablv attached thereto. The bafile plate 3 terminates below the topof the chamber 1 to permit the passage of the burnt gases or othermotive a cut thereover and into the main portion 7 0 said chamber. At asuitable point and preferably in advanceof the bafllc plate 3 I providea 'pipe, 8 for discharging a suitable fluid into the chamber 1 to reducethe temperature of the exhaust motive agent and partially, at least, tostop the expansion thereof. Preferably for this purpose I introduce theoverflow or waste from the circulating water of the engine employed tocool the latter. discharged under pressure into the exhaust chamber 1 atany desired temperature and is there brought into intimate contact withtheexhaust motive agent.

To efiect this result most eliiciently, preferably I spray the water,and for that purpose have herein rep resented a projection or shelf 9extending rearwardly a substantial distance from the head 1 of theexhaust chamber and there terminating in an upwardly extended lip 10provided with a series of perforations 11, wherethrough the water issprayed toward and preferably against the ballle plate 3 and intointimate association with the exhaust passage.

The result of the introduction of the Water in the manner described andits intimate This water is association with the exhaust motive agent ismaterially to reduce thevtemperature of the latter and to stop theexpansion of said agent or largely to reduce the expansion thereof. Theresult of this action is such that there is no pressure within thechamier 1.

In order to secure the best results, the exhaust motive agent isdischarged from the chamber 1 at a point substantially adjacent itspoint of admission thereinto, thus compelling the circulation of saidagent about the chamber, as indicated by arrows in Fig. 1. In saidfigure, I have represented the discharge pipe 12 as communicating withthe bottom of the exhaust chamber l at a point 13 close to the head 5 ofsaid chamber and beneath the lower end of the baffle plate 3. Thus, thecommingled exhaust motive agent and spra water or vapor are effectivelycirculate and eventually discharged as described.

The discharge is effected through some suitable part of the hull, and.preferably through the bottom thereof. In Fig. 1, l have representedaportion of the bottom of the hull at 14 and have represented the pi e 12as extendin downwardly to the hull-and there provided with a dischargeshoe 15, herein represented as extendin ward inclination through the ulland into the water. The shoe 15 is constructed as a short section of pie having a discharge end .16 and a flange 1 by which itmay b cured byscrews 18 or otherwise to the bottom of the hull. The boat when movingforwardly moves in the direction of the 'arrow adjacent Fig. 1,that is,toward the right viewing said figure. fore, be observedthat'the-submerged portion of the shoe is of a general wedge shape, theheel of the wedge being at the rear, and preferably provided with adownwardly extending lip 19.

, When the boat is moving forwardly, the inclined face 20 of said shoe15 forces the -water downwardly ,or away from said surface and it atonce rises at the opposite sides 55, haust motive agent dischargedthrough the outlet 16 of the shoe is discharged directly into thispocket, and Ihave discovered that all noise" of exhaust is eliminated,and that the speed of the boat is not reduced. I attribute this resultto the formation of a partial vacuum or of a chamber or pocket in thewater, whereinto air from the water enters, so that the exhaust motiveagent is not discharged directly into the water but into an air pocketor partial vacuum. The result at a down'-- It will, therei in any caseis to eliminate all noise of the exhaust and to drive the boat at aspeed which is equal-to or greater than that obtained from an openexhaust without a muffler.

It will be observed that the shoe 15 extends, preferably, but a slightdistance below the bottom of the boat, and hence there is little or nodanger that it will come in contact with rocks or other obstructions.The lip 19, which I term a bubble rim, materially assists in causing theformation of the ocket. T e lip 19 constitutes an agitating proectionwhich serves to facilitate the separation of air from the waterbycausing the formation of air bubbles. This separated air immediatelypasses into the pocket formed by the shoe 15 and thus aids in sup plyingair to the said pocket. The air thus received in said pocket assists inmufiiing the exhaustand materially reduces the noise thereof. Themaximum efiicienc'y of the lip is secured by forming it 'upon theinclined face 20 closely adjacent the discharge end 16. The submerged orfinder-water exhaust operates to best advantage when the engine is onthe direct, but will operate satisfactorily on the reverse, but theengine will be sloweddown, because no pocket is formed.

where the discharge pipe 12 connected directlyto the rear end of thechamber 1, particularly if the bafiie plate 3 were not employed.

The exhaust chamber 1 is represented as inside the hull, and preferablyitis located back of the engine. The shoe 15. may and preferably doesterminate at a point close to the hull, but within the scope of myinvention may be extended downwardly or laterally toany desired len h. I

Although Ihave obtaine the best results by spraying the water introducedthrough the pipe 8, it is not. essential that this be done. In the eventthat I employ my invention in connection with a steam engine, Ipreferably do not introduce any fluid through the pipe 8, but 'omit suchfeature of the invention.

'1 do not in this application claim the chamber 1 nor those features ofthe invention immediately co-acting therewith.

Having thus described one illustrative embodiment of my invention, Idesire it to be understood that although specific terms are employed,they are used in a generic and descriptive sense and not for purposes oflimitation, the scope of the invention being set forth in the followingclaims.

1. An under-water exhaust for explosive or other engines comprising ashoe adapted By connecting the discharge pipe 12 at a;

to project through the submerged portion of a boats hull, said shoecomprising a pipe section having a rearwardly and downwardly inclinedwall 20 terminating in an open discharge end 1% and having a downwardlydirected lip 19 projecting angularly from the said inclined wall.

2. An under-water exhaust for explosive or other engines comprising ashoe adapted to project through the submerged portion of a boats hull,said shoe comprising a pipe section having a rearwardly and downwardlyinclined, imperforate, deflecting wall 20 terminating in anopendischarge end 1.6 and having a terminal lip 19 extending substantiallynormal tQsaid'Wall.

3. An under-water exhaust for explosive or other engines comprising asboe adapted to protrude through the submerged portion of a ships hull,the protruding portion of said shoe consisting of a downwardly andrearwardly inclined wall 20 terminating in a downwardly directed angularlip 19, and upright, substantially parallel side walls 21, 22terminating forwardly in the plane of the face of said inclined wall,thereby permitting immediate upward discharge of the water at thelateral edges of the wall. 20.

4. An under-water exhaust for explosive or other engines comprising ashoe adapted to project through the submerged portion a rearwardly anddownwardly directed discharge outlet, and a water agitating lipprojecting from said inclinedsurface closely adjacent the said dischargeend.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

/ NICHOLAS W. MONTGL YVitnesses C. FRANK VVI-IITTEMORE, WM. R.\VHITTEMORE.

